A configuration of switches added to a line control circuit allows for switching back and forth between a configuration featuring a series-connected thyristor switch and reactor and a configuration featuring a parallel-connected thyristor switch and reactor. Connecting the reactor in series with the thyristor switch allows a controlled high-impedance circuit configuration that is particularly well adapted for cold furnace start-ups and furnace idling. In this manner, there is reduced need for such equipment as extra startup transformers, alternate low-voltage power supply configurations and temporary specialty electrical apparatus for cold furnace start-ups.

A method estimates a grid state of an electrical power distribution grid having a multiplicity of network sections, in which a central computer arrangement is used to receive measured values from measuring devices. A state estimation device is used to make a prediction of a future grid state, wherein a voltage and a phase angle are respectively ascertained for each network section, and in that a naive Bayes method is used for the prediction.

A method for compensating for flicker induced by a wind turbine power system connected to a power grid includes operating a power converter of the wind turbine power system based on a nominal reactive current command and a nominal torque command. In response to receiving a periodic torque command modifier, the method includes determining a reactive current command modifier for the power converter based on one or more operational parameters of the wind turbine power system and/or the power grid and the torque command modifier. The method also includes simultaneously modifying the nominal reactive current command as a function of the reactive current command modifier and the nominal torque command as a function of the torque command modifier. Accordingly, modifying the nominal torque command causes low-frequency voltage variations in the power grid and simultaneously modifying the reactive current command attenuates the low-frequency voltage variations.

A method for compensating for flicker induced by a wind turbine power system connected to a power grid includes operating a power converter of the wind turbine power system based on a nominal reactive current command and a nominal torque command. In response to receiving a periodic torque command modifier, the method includes determining a reactive current command modifier for the power converter based on one or more operational parameters of the wind turbine power system and/or the power grid and the torque command modifier. The method also includes simultaneously modifying the nominal reactive current command as a function of the reactive current command modifier and the nominal torque command as a function of the torque command modifier. Accordingly, modifying the nominal torque command causes low-frequency voltage variations in the power grid and simultaneously modifying the reactive current command attenuates the low-frequency voltage variations.

In a consumer arrangement (2) with a power supply (4) with power supply input (6), with a consumer (10) which is supplied with an output power (A) by the power supply (4), wherein the power supply (4) contains a PFC module (12) with a DC link (14), wherein the PFC module (12) contains a regulator (16) for supplying the DC link (14), a characteristic parameter (K) correlated with the output power (A) required by the consumer (10) is fed back into the regulator (16). In a method for operating a consumer arrangement (2) with a power supply (4), with a consumer (10) which is supplied with an output power (A) by the power supply (4), wherein the power supply (4) contains a PFC module (12), wherein the PFC module (12) contains a regulator (16), a characteristic parameter correlated with the output power (A) required by the consumer (10) is fed back into the regulator (16).

One example includes a utility power system. The system includes a power generator system, the power generator system comprising a generator step-up (GSU) transformer and a power generator. The power generator can be configured to provide generator power to a power transmission system via the GSU transformer in a feedback manner based on a predetermined setpoint. The system further includes a voltage droop compensation controller configured to monitor the generator power at a high-side of the GSU transformer and to adjust the predetermined setpoint based on the monitored generator power to substantially mitigate circulating currents.

In a consumer arrangement (2) with a power supply (4) with power supply input (6), with a consumer (10) which is supplied with an output power (A) by the power supply (4), wherein the power supply (4) contains a PFC module (12) with a DC link (14), wherein the PFC module (12) contains a regulator (16) for supplying the DC link (14), a characteristic parameter (K) correlated with the output power (A) required by the consumer (10) is fed back into the regulator (16).

In a method for operating a consumer arrangement (2) with a power supply (4), with a consumer (10) which is supplied with an output power (A) by the power supply (4), wherein the power supply (4) contains a PFC module (12), wherein the PFC module (12) contains a regulator (16), a characteristic parameter correlated with the output power (A) required by the consumer (10) is fed back into the regulator (16).

This disclosure provides a method to limit the post-disturbance node maximum RoCoF by optimizing UC decisions. The node initial RoCoF expressions under common disturbance types, including the load, the line switching, and the generator turbine disturbances, are derived. Then, the piecewise linear relationship between the node initial RoCoF and UC decision variables are obtained. To avoid numerical simulation of the node maximum RoCoF, two analytical constraints, i.e., the node initial RoCoF constraint and the COI maximum RoCoF constraint, are formulated in the UC model.

A control system is disclosed with a control strategy for autonomous multi-bus hybrid microgrids based on Finite-Control-Set Model Predictive Control (FCS-MPC). The control loops are expedited by predicting the future states and determining the optimal control action before switching signals are sent to converters/inverters. The method eliminates PI and PWM components, and offers 1) accurate PV maximum power point tracking (MPPT) and battery charging/discharging control, 2) DC and AC bus voltage/frequency regulation, and 3) precise and flexible power sharing control among multiple DERs.

A device for monitoring a component of a utility network configured to access characteristic data associated with the component and a geographical region where the component is located, generate an operation model for the component, access sensor data for the component, identify a physical strain on the component, identify whether operation of the component is affected by the physical strain, and update the operation model for the component.